Board Thread:Pokémon Help/@comment-33359019-20171105061124/@comment-31398341-20171105090836

As you say you want a tank, I would say Dusclops is better. Dusknoir is used for offensive presence, but Dusclops has significantly better defenses.

I suggest Calm Mind + Shadow Ball set over Power Up Punch + Shadow Sneak. Calm Mind even furthers its special bulk in addition to special attack. Priority is not needed for Dusclops, so Shadow Ball which has decent power is a better option.